Brand Name: COLMI Model Number: COLMI R12 Certification: ce Certification: FCC High-concerned chemical: None Activity Tracked: Activity Tracker Activity Tracked: Steps Tracker Activity Tracked: Distance Tracker Activity Tracked: Calorie Tracker Waterproof Grade: 5ATM Case Material: Steel Item Weight: about 3.3g Battery Capacity(mAh): 15mAh (7#~9#), 18mAh(10#~13#) NFC Support: No Origin: Mainland China Metrics measured: Heart Rate Monitor Metrics measured: Sleep Monitor Metrics measured: Blood Oxygen Monitor Metrics measured: Stress Monitor Display screen: Yes Choice: yes